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Genetic Explanations
of Aggression
Twins studies
McGuffin and Gottesman: Found 87% concordance rate between MZ twins and 72% between
DZ twins for aggressive and anti-social behaviour, supporting genes to explain aggression because
there is a higher concordance rate between MZ twins who share 100% of their genes. However
the concordance…

Page 2

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Gene for aggression
There is no evidence to suggest a gene for aggression but MAOA reduces the level of serotonin in
the blood and is linked with aggression and depression.

Brunner: Researched male members of a Dutch family with very high incidences of violent crime
including rape, murder etc. He…


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